ธรรมยาฤทธิ์ ธ., and บดีรัฐ โ. “Political Awareness Situation of Residents in Udon Thani Municipality”. Local Administration Journal, vol. 11, no. 2, June 2018, pp. 55-71, https://so04.tci-thaijo.org/index.php/colakkujournals/article/view/130486.